Double feed fuel vaporizer



Dec. l, 1931. F. FBRUSH.

DOUBLE FEED FUEL VAPORIZER Filed Sept.

Yak

INVENTOR. BY Z4/w w ATTORNEYS.

Patented Bec. 1,Y 1931 Y l' FREDERICK r. BRUSH, or CHICAGO, ILLINOIS,YAlissIeiNoR'k `ro, PARAGON `VAPORIZHR CORPORATION, or CHICAGO,ILLINOIS,Y A CORPORATION OF ILLINOIS DOUBLE FEED FUEL vAPORIzERApplication flied september 19, 11.928'. serial No. 306,960.

This invent-ion relates to a fuel vvaporizer,

such as are used for internal combustion engines.

In order to operate internal combustion engines, the fuel must be fed tothe cylinders in finely dividen form. Gasoline, the most common form offuel, is readily converted into fine vaporized particles. `The hea-vier-h fdrocarbons are not so easil convertible yet their use would resultin considerable economy. Such heavier hydrocarbons do not vaporize atordinary room temperatures; and even if external heat be applied, suchas by the aid of the exhaust gases, the vaporization is apt to beimperfect.

It is one of the objects of my invention to provide a novel and simplevaporizer for the heavier hydrocarbons, that will convert the fuel intoreadily usable form.

I accomplish this result by providing a gravity feed for the fuel alongthe inner surface of a conduit heated by the exhaust gases;

Such an arrangement works quite satisfactorily for engines having one ortwo cylinders, or for engines of small size, in whichv the intakemanifold is rather short. In larger sizes, or where a manifold is usedhaving a number of parallel paths, I find it advanta-A geous to ensurethat the vaporized fuelis fed uniformly to all parts of the manifold,for otherwise some of the cylinders may receive more fuel than theOthers. Accordingly it is another object of my invention to provideV a.scheine whereby aneven distributionl of fuel is obtained, so that inspite of the existence of unvaporized particlesin the fuel, allcylinders will obtain a fair proportion of the entire fuel charge. n

For this purpose, I provide a split conduit in which the vaporizationis'efected, each-k portion of the conduit leading to a definite set ofCylinders. In this way, as the operation of the cylinders serves to suckin a charge of fuel and air through the conduit, the suction isalternated between the sections of the conduit, and fuel isindependently drawn (as by the aid of a Venturi opening) by the suctioninto each section as needed.

My invention possesses many other advan tages, and has other objectswhich may be made more easily apparent froin'a consideration of oneembodiment of my invention.Y For this purpose I have shown a form in thedrawings accompanying' and forming part ofthe present speciiication. Ishall now proceed to describe this form: in'detail, which illustratesthe general principles of my invention; but it is to-be understoodthatrthis l Fig.' 2 is an enlarged section taken along plane 2&2 ofFig. 1. i

In 'F ig. 1, I show an enginell, having two or more intake openings 12,and corresponding outletfopenings i8; each of-'tliese openings, as iswell understood, being associated with.- a cyliiider.-A ,The intakemanifold 14, leading to both intake openings 12, has an air inlet 15,through which air is sucked on the intake stroke Of any of the pistons.A throttle valve 16 can be provided in this passageway.

vThe suction thus created causes a Spring pressed valve 17 to open. Thisvalve can be of Conventional design, and arranged to pass the airdownwardly through a carburetting y device. This device will be now morethoroughly described'. i

n stares 1 'CE1 y* i vFuel is arranged to be commingled with the streamof air flowing downward past the valve 17. In order to increase thevelocity of the air where the fuel enters so as to pull the fuel intomanifold Conduity 14 readily, it is preferred to provide a constriction,or a. venturi, in this conduit.y Thus I show apertures 1S, 19, leadingfroma float chamber 2O (F ig. 2) that is suppliedwith liquid fuel, into.the conduit 14. Both apertures 18, 19 can be controlled as `by needlevalves 21,22 eX- tending outside ofthe float chamber for readymanipulation. n

The conduit 14 is surrounded by the outlet manifold 23 to impart heat tothisjconduit, the exhaust gases finally emerging from the outlet opening24. The fuel flows down the sides of conduit 14, and is vaporized by theheat developed in the exhaust manifold 23. Whatever is left unvaporizeddrips into pockets 25 in the bottom portion 26 of manifold 14, and isthere later vaporized by the heat.Y

One of the important features of myinvention resides in the provision ofseparate pas-k sagevvays in conduit 14, whereby the fuel feedV to a partof the cylinders is entirely separate fromv the feed totheotherfcylinders. In this Way, it is assured that each set ofCylinders will receive its full quota of fuel, even if the manifold 14is of such a character that it does not provide smooth and easypassagewaysfor the fuel. Thus there 'is a partition Wall 27 y in conduit14, dividing the conduit into tWo portions, each controlled loyvr eitherof the throttle valves-28 and 29, and each having independent Venturiopenings 30, 31. In this Wav the yfeeding of the mixture `of fuel and Yairtoboth parts of the manifold isl made substantially uniform.

I claim Y lIn a fuel'vaporizer for an lnternal combustion enginehaving aplurality o-f substantially vertical passageways, each passagewayleading to a different group of thelcylinders, means for dripping liquidfuel Y into each passageway so that the fuel forms a layeron theinner'surfaoe thereof, means for heating thepassagewayspneans providinga space in the manifold Where the unvaporized fuel can collect bygravity, and means for heating saidspace.k n Y n 1 In testimony whereofI have hereunto set my hand. i e o FREDERICK I". BRUSH.

